The 2016 Chevrolet Volt range-extended electric car, which will be unveiled this morning at the Detroit Auto Show, is sleeker, has more electric range, and is projected to get higher gas mileage when its engine is operating.

The compact five-door hatchback also has a fifth "seating position," although Chevy has stressed that it's for occasional use.

After all the teaser photos and much discussion of what it would or should have, the new 2016 Chevy Volt expands on the qualities that made the first-generation Volt the highest-rated car GM has ever built.

A number of commentators said that any new Volt had to hit the "50-50-5" benchmark: 50 miles of range, 50 mpg, and five seats.

Its two electric motors can now both power the vehicle, and one also acts as a generator. The engine can also clutch in to assist the traction motors once the battery is depleted, when that would boost efficiency at higher speeds.

The T-shaped battery pack, again using LG chem lithium-ion cells, now has a capacity of 18.4 kilowatt-hours--up from the 2015 Volt's 17.1 kWh. Once again, it's liquid-cooled.

The styling of the new Volt uses design language from the Corvette sports car and Impala large sedan, Chevy designers said, with sculpted body sides that eliminate the previous generation's slab-sided look.

The cowl is lower and the front has a slight V-shape to the nose, which again is a textured silver blanking plate where a grille would be on a conventional car.

The interior is considerably more conventional than the capacitive touch switches on the first Volt, maintaining the characteristic Chevrolet twin-cockpit look while offering predictable knobs and buttons for functions like heating and air conditioning.

The 2016 Chevrolet Volt will go on sale in the second half of 2015. Trim levels and pricing will be announced closer to the car's on-sale date.